Python 3 read() function

[Christian Heimes]

Terry Reedy wrote:
> Timing of os interaction may depend on os.  I verified above on WinXp 
> with 4 meg Pythonxy.chm file.  Eye blink versus 3 secs, duplicated.  I 
> think something is wrong that needs fixing in 3.0.1.
> 
> http://bugs.python.org/issue4533

I've attached a patch to the bug. reading was so slow because the 
fileio_readall() was increasing the buffer by 8kB in each iteration. The 
new code doubles the buffer until it reaches 512kB. Starting with 512kB 
it's increased in 512kB blocks. Python 2.x has the same growth rate.

Christian